Automated stress-strain characterization for adhesive forces
This solution offers a novel method for automated stress-strain characterization of adhesives using a mechanical tester, enhancing the precision and scalability of adhesive failure analysis.
Overview
This innovative solution proposes an automated system for characterizing the mechanical properties of adhesives through stress-strain analysis. By utilizing a mechanical tester with a custom-built mount, this approach automates the process of measuring force-displacement during adhesive failure. This method provides a quantitative and scalable way to evaluate the mechanical strength, tear, and yield of various adhesives, overcoming the limitations of traditional scrape, tape, knife, and pull-off tests.
Technical specifications
The system uses a mechanical tester to push a wedge into a coated or adhered substrate, functioning like an automated paint scraper. The process is controlled by a computer program designed to maximize throughput while analyzing data effectively. The solution supports customization for different test profiles, sample types, and standards. It achieves a resolution up to 0.13% strain for 10-micron coatings and higher resolution for thicker coatings. The method includes testing for creep by varying pushing rates and measuring hysteresis loops for identifying plastic deformation.
Technology readiness level
Currently at Technology Readiness Level 3, this solution has been validated through proof-of-concept tests. These tests demonstrated that adhesive tear corresponds to dips in force-displacement measurements, with each test taking approximately one minute. Ongoing development will focus on enhancing reproducibility and throughput, with future plans to refine mount designs and analysis software.
About Eric Brown Labs, LLC
Eric Brown Labs, LLC is an independent research organization operated by physicist Eric Brown. Established as a non-profit entity following Brown's tenure as a professor at Yale University, the laboratory focuses on conducting scientific research for the public good, with an emphasis on advancing knowledge in physics and materials science. The laboratory operates outside the traditional university model, seeking funding from government research agencies while prioritizing educational and research activities over profit. Brown’s work spans various areas of condensed matter physics and fluid dynamics, including studies on granular materials, shear thickening fluids, and magnetic liquid metal suspensions intended for laboratory-scale dynamo experiments.
Beyond its core research initiatives, the laboratory provides access to specialized materials testing equipment for shared use or consulting engagements. This includes a high-speed camera, a rheometer for measuring non-Newtonian fluid properties, and a dynamic materials tester for stress-strain analysis. By offering these facilities and expertise in data analysis and modeling, the laboratory supports collaborative projects and industrial applications. Past research contributions include the development of a universal robotic gripper using jammable granular materials, a project conducted in collaboration with iRobot Corporation and academic partners to simplify robotic grasping systems.
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